Drill-sharpener.



No. 758,926. PATENTED MAY 3, 1904. D. G. MORGAN.

DRILL SHARPENER.

APPLICATION FILED JULY '7, 1903.

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Witnesses No. 758,926. PATENTED MAY 3, 1904.

D. G. MORGAN.

DRILL SHARPENER.

APPLIOATION FILED JULY 7. 1903.

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ivaiwmmw PATENTED MAY 3, 1904.

D. G. MORGAN. DRILL SHARPENEB.

APPLICATION FILED JULY 7, 1903.

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UNITED STATES Patented May 3, 1904.

DAVID Gr. MORGAN, OF CHINESE, CALIFORNIA.

DRlLL-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 758,926, dated May 3, 1904. Application filed July 7,1903. Serial No. 164,509. (No model.)

To (r/ll whom it may concern.-

Be it known that 1, DAVID G. MORGAN, a citizen of the United States, residing at Chinese, county of Tuolumne, State of California, have invented an Improvement in Drill-Sharpeners; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to a machine for sharpening rock-drills, and particularly drills of the type having a hollow shank and radiallydisposed cutting-bits.

It consists of the parts and the construction and combination of parts hereinafter more fully described, having reference to the accompanying drawings, in which Figure 1 is a side elevation of my invention. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a transverse section on line (I: a", Fig. 1, showing clutch mechanism of follower. Fig. 4 is a transverse section on line y y, Fig. 1. Fig. 5 is a transverse section on line 2 2', Fig. 1. Fig. 6 is a transverse section on line 0 0, Fig. 1. Fig. 7 is an enlarged longitudinal section of the clutch devices of Fig. 1.

A represents a drill such as is commonly used for perforating rock and which is made hollow to admit water to the point of the drill and is provided with a plurality of cutting edges or bits a, disposed in the form of a cross. Through use the corners of the drill become worn away until it cuts ahole of lessening diameter, whereupon it becomes necessary to extend the bits to the proper length and to sharpen and true the edges. The difficulty of hand-sharpening drills of this type is increased by the necessity of keeping open the central perforation. I have devised a machine which will not only automatically swage, spread, and sharpen the bits, but will keep the central water-feed passage open properly.

B G represent two suitably-mounted axially-alined casings of any suitable size and design. They are here shown as two opposed cylinders, the one, B, carryingthe drill-holding and clamping means, the other, C, the

swages or dies 2, by which the drill is spread and sharpened, and the mandrel 3, by which the perforation 4 in the drill is protected. Casing C incloses a reciprocating carriage or chuck 5, having inclined guides in which the dies or sectional dollies 2 are slidably held. These dies converge toward one another at the end of the casing adjacent to the drillclamp casing B and are adapted to be expanded or contracted according as the carriage 5 is reciprocated toward one end or the other of its casing. The ends of the dies protrude through the slotted heads of easing B. The points of the dies are provided with radial V-shaped grooves 6, and the drill is presented so that the edges of the drill-bits a will lie within these grooves. The opposite ends of the dies are adapted to receive the impact of a pneumatic or like hammer 7 I/Vithin casing B is a hollow reciprocating carriage 8, similar to the die-carriage 5 and supporting on its inner periphery the slidable clamp members or jaws 9. The latter are each disposed in line with a corresponding die 2, so that when a drill is inserted into the jaws and clamped the edges of the bits Will engage in the corresponding V-shaped grooves in the end of the dies.

The jaws unlike the dies are held against end movement by the projections 10, which engage the ends of casing B. The jaws are expanded and contracted according as carriage 8 is reciprocated. The exposed faces of the jaws are longitudinally grooved, as at 11, to accommodate the corners of the expanded head of the drill when the latter is inserted into the, machine. The ends of the jaws adjacent to the dies are flared, as at 12, to pr0- vide an inclined support for the back of the drill-head.

Each of the carriages or movable chucks 8 and 5 has the lateral projections 13 extending out through slots in their respective casings and engaged by forked levers 14: 15, one relative to each chuck. Lever 14 on casing Bis provided with a pawl-and-rack mechanism 16, so that after a drill has been inserted into the machine and chuck 8 moved to contract the slides on the spindle of the pulley 21.

jaws to clamp and center the drill the chuck is locked against backward movement, while the dies are actuated to spread and sharpen the bits.

Mandrel 3 is supported and slidable in the heads of easing C and is disposed in axial alinement with the drill-space inclosed by the jaws, so that when a drill is inserted into the jaw-opening and clamped the center opening t of the drill will be in line with the tapered end of the mandrel. When the hammer 7 is actuated, the mandrel will be advanced simultaneously with the dies, the latter swaging and sharpening the previously-heated drill, the mandrel penetrating the drill-hole 4 and affording a solid support to itsthin sides against the impact of the hammer. Thus while the dies will work the metal outward toward the .corners of the bits the mandrel will prevent the hole in thedrill from being closed and will assist in sharpening the edges of the drill intermediate of the bits. After each blow by the hammer the pin or mandrel is retracted by means of a helical spring 17 During the swaging operation the lever 15 is constantly oscillated to reciprocate chuck 5, so that while the dies or dollies are vibrat ing rapidly upon the drill-bits the dies are being constantly expanded and contracted, so that they never hit twice in the same place, and the metal is worked from the center of the drill out to the corners.

The radial expansion and contraction of the jaws allow for drills of various sizes to be sharpened in the same machine.

18 is a follower-block or deadman, as it is called, against which the outer end of the drill may be solidly supported during the operation of hammering and relieve the clamp mechanism of unnecessary strain and shock. This follower is slidable on suitable guides 19 and is reciprocated thereon to suit drills of various lengths by means of a chain 20 passing over sprockets 21. A spring-actuated clutch mechanism 22 is adapted to embrace the spindle of one of the sprockets and engage its hub to lock the block against the end of the drill.

As shown in Fig. 7 one member of the clutch is carried on a non-rotatable sleeve 22', which This sleeve carries a pin 30, which operates in a slot 31 in the journal-box. To move the follower, the sleeve is pulled outward, and the pin is engaged behind a shoulder 32 of the slot, which releases the clutch, and to lock the follower the sleeve is turned, and the spring causes the clutch members to engage.

By this machine all the bits of a drill are fulled or spread and sharpened simultaneously.

.The number and character of the dies may be varied according to the number and character of the bits of the drills sharpened.

with its bits in opposition to the dies, whereby I all the bits may be sharpened simultaneously, a mandrel in axial alinement with the drill, and jaw series and means for actuating the dies.

2. The combination in a machine for sharpening hollow drills, of grooved spreading-dies, jaws for adjustably holding the drill with its bits in juxtaposition to the grooves in said dies, areciprocable mandrelin axial alinement with the drill so held and actuating mechanism for said dies and mandrel.

3. In a machine for sharpening hollow drills, the combination of expansible reciprocating dies, jaws for adjustably holding the hollow drill with its bits in opposition to the dies, whereby all the bits may be sharpened simultaneously, a mandrel in axial alinement with the drill so held, means including reciprocable carriers by which the dies may be expanded and contracted, and mechanism for actuating the dies and jaws.

4:. The combination ina machine of the class described, of a plurality of reciprocable expansible dies, expansible jaws for holding a drill relative to said dies, a reciprocable normally retracted mandrel in axial alinement with the drill so held and actuating mechanism for said dies, jaws and mandrel.

5. The combination in a machine of the class described, of converging reciprocable dies, actuating means therefor, means including a reciprocable carrier by which the dies may be expanded or contracted, jaws by which a drill is held relative to said dies, a mandrel axially in line with the drill so held, means including a reciprocable carrier opposing the first-named carrier by which the jaws are actuated, and means for reciprocating said carriers.

6. The combination in amachine of the class described, of suitably-supported opposed reciprocable carriers each having inclined, longitudinal, convergent guides, dies reciprocable in the guides in one carrier, and jaws slidable in the guides of the other carrier, said jiaws adapted to hold a drill relative to said ies.

7. The combination in a machine of the class described, of suitably-supported, opposed reciprocable carriers, each having inclined longitudinal convergent guides, the converging ends of said guides in each carrier lying adjacent to one another, dies slidable in the guides of one carrier and having a limited reciprocating movement independent'of the carrier, jaws slidable in the guides of the other carrier and adapted to hold a drill relative to said dies, means for preventing end movement of the jaws, and actuatingmeans for the carriers and dies.

8. The combination in a machine of the class described, of suitably-supported, opposed reciprocable carriers, convergent reciprocable expansible dies supported by one carrier, expansible jaws in the other carrier by which a drill is held relative to the dies, actuating means for the dies, and a follower disposed in the path and rearward of the drill so held.

9. The combination in a machine of the class described, of opposed reciprocating carriers, supports therefor, expansible jaws carried by and operable by one of said carriers, dies carried by and expansible by the other carrier, said jaws adapted to hold a drill relative to the dies, a reciprocable mandrel coacting with said dies, an adjustable follower disposed in the path and rearward of the drill so held, means for reciprocating the carriers, and actuating means for the dies and mandrel.

10. The combination with suitable dies and drill-holding means, of a reciprocable follower engaging the rear end of a drill so held, and operating means for said follower including an endless flexible connection, pulleys around which said connection passes and means whereby the follower may be locked against backward movement.

11. In a machine for sharpening drills the combination of a plurality of radially expansible and contractible reciprocating dies disposed in a plurality of intersecting planes,

means longitudinally in line with the dies for holding a drill in opposition to said dies, a mandrel coaxial with the die series, and means for reciprocating and for expanding and contracting said dies.

12. In a machine for sharpening hollow drills having a plurality of cutting-bits lying in intersecting planes, the combination of expansible and contractible reciprocating dies disposed in a plurality of intersecting planes and adapted to sharpen all of said bits simultaneously, a series of jaws for holding the drill with its bits in opposition to the dies, and a mandrel coaxial with the die series and also with the jaw series and adapted to engage in the hole in the drill to keep the same open during the swaging operation.

13. In a machine for sharpening hollow drills, the combination with drill holding means, of a series of expansible and contractible reciprocating dies opposing the drillholding means and disposed substantially longitudinally in line therewith, a reciprocating carriage for said dies, means for reciprocating said carriage and means for reciprocating the dies, a mandrel coaxial with said die series and the drill-holding means, and means for reciprocating said mandrel coordinately with the operation of the dies.

1 In1 witness whereof I have hereunto set my iant.

DAVID G. MORGAN.

Witnesses:

S. H. NOURSE, N. E. WV. SMITH. 

